Grate



A. D. CRONIN April 18, 1933.

GRATE Filed Jan! 28, 1951 INVENTOR.

{75071 C'Qo/w' W ATTORNEY.

Patented Apr. 18, 1933 NITE rat s Pars ARTHUR D. CRONIN, OF DETROIT, IVIIGHIGAN, ASSIGNOR TO. COMBUSTION MACHINERY r oFrcE COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE GRATE My invention relates to a new and useful improvement in a grate adapted for use in furnaces and the like and particularly adapted for use in a furnace in which there is built up, below the grate on which the fuel is used, a fluid pressure by air, steam or the like, which will pass through the grate and assist in the combustion of the fuel.

It is an object of the present invention to provide a grate of this class in which a uniform distribution of the blast over the entire area of the grate and consequently a uniform filtration of the blast through the fuel may be effected. 7

It is another object of the present invention to provide a grate of this class having a plurality, of openings therethrough communicating with tubular members projecting downwardly from the under surface of the grate thus minimizing any localization of blast on any particular or defined area of the grate.

Another object of the present invention is the provision of a grate of this class which F will be simple in structure, economical of manufacture, durable and highly efficient in use, and provided with a Venturi passage for the blast so. as to increase the efficiency thereof and make it possible to use a low pressure beneath the grate.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of parts hereinafter described and claimed.

' The invention will be best understood by a reference to the accompanying drawing which forms a part of this specification, and in which,

Fig. 1 is a central vertical sectional view through a furnace showing the invention applied.

Fig. 2 is a fragmentary top plan view of the invention.

F ig. 3 is a fragmentary sectional View taken on line 33 of Fig. 2.

Fig. 4 is a sectional view taken on line H of Fig. 3.

In the drawing I have illustrated the invention used with a furnace having a front wall 7 positioned rearwardly of which is a bridge wall 8 which serves to assist in supporting thegrate which in the main consists of a plate 9 having on its undersurface rein forcing ribs 10 which extend from the down wardly projecting tubes 11 having at the lower-end a-tapering passage-12 c'ommrmi'cating adjacent the upper end with the flaring passage 13 to provide the Venturi effect and permit air or a similar fluid pressure built up in the compartment 15 below the grate to emit through the openings 14.. As shown, a number of tiese openings areinclinedto the plane of the plate 9. Inthe drawing, I have illustrated an air inlet opening 16 through which air may be deliveredunder pressure to the compartment or chamber 15 and permitted to travel as shown by the arrows to all parts of the chamber 15. r

The ribs 10 serve as cooling fins as well as reinforcing members, and by forming the tubes 11 integral with the plate 9, an economy in manufacture is provided and ease in as distribution of the blast and eliminating the I necessity of as high a pressure in the chamber 15 as would be required were there no openings 1 1 except those to which the tubes lead.

While I have illustrated and described the preferred form of construction of my invention, I do not wish to limit myself to the precise details of structure shown, but desire to avail myself of such variations and modifications as may come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A grate of the class described, comprising: a plate; a plurality of tubes projecting downwardly from the undersurface of said plate; reinforcing ribs projecting downward- 1y from the undersurface of said plate and extending between and connecting to said tubes, said plate having a plurality of openings formed therethrough communicating with each of said tubes.

2. A grate of the class described, comprising: a plate; a plurality of tubes projecting downwardly from the undersurface of said plate; reinforcing ribs projecting downwardly from the undersurface of said plate and extending between and connecting to said tubes, said plate having a plurality of openings formed therethrough communicating with each of said tubes, there being formed in said plate between said ribs a plurality of openings.

3. A grate of the class described, comprising: a plate; a plurality of tubes projecting downwardly from the'undersurface of said plate in spaced relation; a plurality of ribs projecting downwardly from the undersurface of said plate and extending between said tubes and connecting thereto, said plate having a plurality of openings formed therein communicating with each of said tubes and provided with a plurality of openings between saidribs.

In testimony whereof, I have signed the foregoing specification.

ARTHUR D. CRONIN. 

